1. Letter from Mark H. McCormack to Andre J. Heiniger Creator: McCormack, Mark H.; Heiniger, Andre J., 1921-2000 Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: October 1, 1984 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
2. Letter from Mark H. McCormack to Cliff Minshull Creator: McCormack, Mark H.; Minshull, Cliff Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: January 18, 1974 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
3. Letter from Mark H. McCormack to Frank Hannigan Creator: McCormack, Mark H.; Hannigan, Frank Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: May 8, 1986 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
4. Letter from Mark H. McCormack to Frank Hannigan Creator: McCormack, Mark H.; Hannigan, Frank Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: April 28, 1986 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
5. Letter from Mark H. McCormack to Gaetan Mourgue d'Algue Creator: McCormack, Mark H.; d'Algue, Gaetan Mourgue Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: January 11, 1971 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
6. Letter from Mark H. McCormack to Ian Chapman Creator: McCormack, Mark H.; Chapman, Ian Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: June 21, 1971 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
7. Letter from Mark H. McCormack to Jack Urlwin Creator: McCormack, Mark H.; Urlwin, Jack Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: March 9, 1973 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
8. Letter from Mark H. McCormack to John Z. DeLorean Creator: McCormack, Mark H.; De Lorean, John Z. Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: November 11, 1970 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
9. Letter from Mark H. McCormack to Michael Attenborough Creator: McCormack, Mark H.; Attenborough, Michael Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: November 6, 1970 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
10. Letter from Mark H. McCormack to Murray Barnes Creator: McCormack, Mark H.; Barnes, Murray Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: November 11, 1970 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
11. Letter from Mark H. McCormack to Patrick Heiniger Creator: McCormack, Mark H.; Heiniger, Patrick Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: July 6, 1984 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
12. Letter from Mark H. McCormack to Ray Ablondi Creator: McCormack, Mark H.; Ablondi, Raymond A. Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: November 11, 1970 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
13. Letter from Mark H. McCormack to Richie Benaud Creator: McCormack, Mark H.; Benaud, Richie Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: May 18, 1973 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
14. Letter from Mark H. McCormack to Richie Benaud Creator: McCormack, Mark H.; Benaud, Richie Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: March 9, 1973 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
15. Letter from Mark H. McCormack to Robert L. Garrison Creator: McCormack, Mark H.; Garrison, Robert L. Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: November 11, 1970 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
16. Letter from Mark H. McCormack to Robert Sommers Creator: McCormack, Mark H.; Sommers, Robert (Robert T.) Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: December 4, 1972 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
17. Letter from Mark H. McCormack to Sam McKinley Creator: McCormack, Mark H.; McKinley, Sam Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: March 9, 1973 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
18. Letter from Mark H. McCormack to Stan D. Houston Creator: McCormack, Mark H.; Houston, Stan D. Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: March 15, 1973 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
19. Letter from Mark H. McCormack to T. E. R. Bray Creator: McCormack, Mark H.; Bray, Terry Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: November 11, 1970 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives
20. Letter from Mark H. McCormack to Victor M. Wallis Creator: McCormack, Mark H.; Wallis, Vic Format: Letters/Correspondence; Manuscripts Collection: Mark H. McCormack Papers, ca. 1920-2008 (bulk: 1957-2003) Date: November 11, 1970 Institution: University of Massachusetts Amherst Libraries Special Collections and University Archives